Apparatus for rolling spiral or helicoidal springs.



G. 0. GUSTAVSEN.

APPARATUS FOR ROLLING SPIRAL 0R HELIGOIDAL SPRINGS. APPLICATION FILEDMAR. 7, 1906.

907 ,594 Patented Dec. 22, 1908.

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J m M UNITED STATES PATENT OFFICE.

CHARLES OSCAR GUSTAVSEN, OF COLUMBUS, OHIO.

APPARATUS FOR ROLLING SPIRAL OR HELIC OIDAL SPRINGS.

Specification of Letters Patent.

Patented Dec. 22, 1908.

Application filed March 7, 1906. Serial No. 304,709.

TAVSEN, a citizen of the United States, resid- 5 ing at Columbus, in thecounty of Franklin and State of Ohio, have invented certain new anduseful Improvements in an Apparatus for Rolling Spiral or HelicoidalSprings, of which the following is a specification.

Heretofore it has been customary to make spiral springs by twisting thestock around a suitable mandrel, to make the spring of such form asdesired. While it is possible to form springs in this manner, yet theoperation tends to break down and weaken the stock rather than tostrengthen the same. By means of my improved apparatus and method, whichwill be fully described hereinafter, the stock is rolled into thedesired helicoidal form, preferably while hot, thereby tending tostrengthen the material by working it lengthwise of the grain andconsequently forming better springs.

In the drawings accompanying this application; Figure 1 is a side-viewof the mechanism used to form the spring, one set of cones of theforming rolls being shown in cross-section, and the driving means beingomitted, and, Fig. 2 is a cross-sectional view, showing the spring beingformed thereon.

According to this invention, the helicoidal spring, of any desiredcross-section, is to be formed from the stock by rolling the latterthrough suitable rolls, which will give it the desired turns to make thespring. I prefer to use substantially conical, coacting rolls 3 and 4,as shown in the drawings; and for springs of round cross-section, theserolls are provided with one or more semi-circular grooves 5, 6, and 7,the grooves of the two rolls coming together on the tangential linebetween the two rolls, as shown in Fig. 1.

The object of having a plurality ofgrooves, is to enable different sizedsprings, or springs having a larger central opening, to be formed on thesame pair of rolls. I also prefer to interlock the conical rolls byforming shoulders 8 and 9 in one of said rolls, which enter grooves 10and 11 in the other roll. These interlocking collars will prevent therolls from creeping or sliding out of alinement. The pair of rolls arepreferably driven so that they have the same peripheral speed. This maybe done in any desired manner, and the rolls may also be mounted in anysuitable frame, such frame and driving one pair of the forming rollswith a means forming no part of the present invention.

For convenience in construction and to add to the strength and rigidityof the apparatus, I prefer to connect two horizonta rolls by means of ashaft 12, said shaft, rolls, and the trunnions for said rolls, all beingformed of one suitable piece of material. By having a second verticalroll to coact with the second I I I l l horizontal roll, enables me tomake right and left hand springs on the same machine. In order to guidethe stock which is fed to the rolls, I prefer a guide 13, which may besupported in any suitable manner from the frame; I also provide asecond, or discharge uide 14, referably of substantially the same orm ast e spring to be made. This dis charge guide may also be supported inany desired manner from the frame.

In operation, the rolls being given the proper turning movement, thestock 15 is fed through the guide 13 into one of the grooves, as 5, andin assing through said groove between the ro ls, is given the ropertwist or form to make the desired he icold. As the stock comes throughthe groove, it engages with the discharge guide 14 and is preferably Idirected onto a sup orting rod or pipe 16, as shown in Fi 2. t will benoted that, on account of t e itch or arrangement of the cones, the specof the outer portion of the pass formed between the rolls is greaterthan the speed of the inner ortion, and, as the stock which is fed intot e'pass is of slightly greater diameter than the pass, this fastermovement will cause the stock to be-drawn out or elongated on one side,and it is this elongation which forms the stock into the desiredhelicoid or spiral. ing tendency while passing between the formingrolls, not only gives the stock the proper sha e, but also strengthensthe same by worlling it lengthwise of the grain and compressin thematerial in the pass between said rol s.

It is obvious that'various changes may be made in the details ofconstruction and in the form of the rolls without parting from thespirit of this invention, and I do not wish to hmit myself to the exactconstruction herein shown, which is intended more as a diagrammaticalillustration than as a working drawing, but What I claim and desire tosecure by Letters Patent is:

1. In an apparatus for rolling spiral or heli- This rolling or form-'coidal springs, the combination of two conical rolls having groovestherein to form a passof slightly less cross-section than the tiallygreater than the speed of the inner portion, whereby the stock, as it isdrawn throughthe pass, will be upset and rolled into a spiral orhelicoidal form.

2. In an apparatus for rolling spiral or helicoidal springs, thecombination of two conical rolls having their axes arranged atapproximately 90 to each other, a ass formed etween said rolls forreceiving t e stock to be formed into a helicoid, said I ass being ofslightly less cross-section than t e stock, the arrangement being suchthat the speed of the outer portion of the tially greater than the speedof the inner por tion, whereby the inner side of the stock, as it isforced through the pass, will be at the inner part of the helicoid,while the outer and faster moving the outer part-of the helicoid.

CHARLES OSCAR GUSTAVSEN.

Witnesses:

/ SIMON WISSLOR, B. H. YATES, F. E. SLABAUGH;

pass will be substan- 2O portion of the stock-will form 25

